Question:
Blue powder is the byproduct of Zinc extractions and it contains mainly:
Blue powder is the byproduct of Zinc extractions and it contains mainly:
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Blue powder forms due to condensation and oxidation of zinc vapours.
Updated On: Jun 29, 2026
- Mixture of zinc and zinc oxide
- Mixture of zinc and zinc sulphide
- Mixture of zinc oxide and zinc hydride
- Mixture of zinc sulphide and zinc oxide
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The Correct Option is A
Solution and Explanation
Concept:
In zinc metallurgy (especially distillation process), fine zinc dust is produced which is called:
\[
\text{Blue powder}
\]
It forms due to:
- partial oxidation of zinc vapours
- condensation of zinc particles
- presence of Zn and ZnO mixture
Step 1: Formation mechanism.
During condensation: \[ Zn_{(vapour)} \rightarrow Zn_{(solid)} \] and partial oxidation: \[ Zn + \frac{1}{2}O_2 \rightarrow ZnO \]
Step 2: Composition.
Hence blue powder contains: - metallic zinc - zinc oxide Final Answer: \[ \boxed{\text{Mixture of zinc and zinc oxide}} \]
Step 1: Formation mechanism.
During condensation: \[ Zn_{(vapour)} \rightarrow Zn_{(solid)} \] and partial oxidation: \[ Zn + \frac{1}{2}O_2 \rightarrow ZnO \]
Step 2: Composition.
Hence blue powder contains: - metallic zinc - zinc oxide Final Answer: \[ \boxed{\text{Mixture of zinc and zinc oxide}} \]
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